Mach number mach number • macho · · · Info · Definitions · Characters · · Mach number · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) the ratio of the speed of a moving body to the speed of sound. Synonyms: Mach number. · · Noun Definition 1 Characters · · space U+0020 M latin capital letter m U+004D a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 u latin small letter u U+0075